Submission #961036

#	Time	Username	Problem	Language	Result	Execution time	Memory
961036		pcc	Red-blue table (IZhO19_stones)	C++17	17 / 100	486 ms	1456 KiB

stones

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>

int ans[22][22],C[22][22];
int row[22],col[22];

void calc(int r,int c){
	int big = 0,cnt = 0;
	for(int i = 0;i<(1<<(r*c));i++){
		for(int j = 0;j<r;j++)row[j] = 0;
		for(int j = 0;j<c;j++)col[j] = 0;
		for(int j = 0;j<r;j++){
			for(int k = 0;k<c;k++){
				if(i&(1<<(j*c+k)))row[j]++,col[k]++;
			}
		}
		int tc = 0;
		for(int j = 0;j<r;j++){
			tc += (row[j]>c-row[j]);
		}
		for(int j = 0;j<c;j++){
			tc += (r-col[j]>col[j]);
		}
		if(tc>cnt)cnt = tc,big = i;
	}
	ans[r][c] = cnt;
	C[r][c] = big;
}

void prep(){
	for(int i = 1;i<=5;i++){
		for(int j = 1;i*j<=20;j++)calc(i,j);
	}
	return;
}

void solve(int r,int c){
	string s[r];
	for(int i = 0;i<r;i++){
		for(int j = 0;j<c;j++){
			if(C[r][c]&(1<<(i*c+j)))s[i] += '+';
			else s[i] += '-';
		}
	}
	cout<<ans[r][c]<<'\n';
	for(auto &i:s)cout<<i<<'\n';
	return;
}

int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	prep();
	int t;
	cin>>t;
	while(t--){
		int r,c;
		cin>>r>>c;
		solve(r,c);
	}
	return 0;
}

• Subtask 1: 17 / 17
• Subtask 2: 0 / 10
• Subtask 3: 0 / 16
• Subtask 4: 0 / 11
• Subtask 5: 0 / 15
• Subtask 6: 0 / 31